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Linux kernel mirror (for testing)
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linux
1/*
2 * NetLabel System
3 *
4 * The NetLabel system manages static and dynamic label mappings for network
5 * protocols such as CIPSO and RIPSO.
6 *
7 * Author: Paul Moore <paul.moore@hp.com>
8 *
9 */
10
11/*
12 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
22 * the GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 *
28 */
29
30#ifndef _NETLABEL_H
31#define _NETLABEL_H
32
33#include <linux/types.h>
34#include <linux/net.h>
35#include <linux/skbuff.h>
36#include <net/netlink.h>
37#include <asm/atomic.h>
38
39/*
40 * NetLabel - A management interface for maintaining network packet label
41 * mapping tables for explicit packet labling protocols.
42 *
43 * Network protocols such as CIPSO and RIPSO require a label translation layer
44 * to convert the label on the packet into something meaningful on the host
45 * machine. In the current Linux implementation these mapping tables live
46 * inside the kernel; NetLabel provides a mechanism for user space applications
47 * to manage these mapping tables.
48 *
49 * NetLabel makes use of the Generic NETLINK mechanism as a transport layer to
50 * send messages between kernel and user space. The general format of a
51 * NetLabel message is shown below:
52 *
53 * +-----------------+-------------------+--------- --- -- -
54 * | struct nlmsghdr | struct genlmsghdr | payload
55 * +-----------------+-------------------+--------- --- -- -
56 *
57 * The 'nlmsghdr' and 'genlmsghdr' structs should be dealt with like normal.
58 * The payload is dependent on the subsystem specified in the
59 * 'nlmsghdr->nlmsg_type' and should be defined below, supporting functions
60 * should be defined in the corresponding net/netlabel/netlabel_<subsys>.h|c
61 * file. All of the fields in the NetLabel payload are NETLINK attributes, see
62 * the include/net/netlink.h file for more information on NETLINK attributes.
63 *
64 */
65
66/*
67 * NetLabel NETLINK protocol
68 */
69
70#define NETLBL_PROTO_VERSION 1
71
72/* NetLabel NETLINK types/families */
73#define NETLBL_NLTYPE_NONE 0
74#define NETLBL_NLTYPE_MGMT 1
75#define NETLBL_NLTYPE_MGMT_NAME "NLBL_MGMT"
76#define NETLBL_NLTYPE_RIPSO 2
77#define NETLBL_NLTYPE_RIPSO_NAME "NLBL_RIPSO"
78#define NETLBL_NLTYPE_CIPSOV4 3
79#define NETLBL_NLTYPE_CIPSOV4_NAME "NLBL_CIPSOv4"
80#define NETLBL_NLTYPE_CIPSOV6 4
81#define NETLBL_NLTYPE_CIPSOV6_NAME "NLBL_CIPSOv6"
82#define NETLBL_NLTYPE_UNLABELED 5
83#define NETLBL_NLTYPE_UNLABELED_NAME "NLBL_UNLBL"
84
85/*
86 * NetLabel - Kernel API for accessing the network packet label mappings.
87 *
88 * The following functions are provided for use by other kernel modules,
89 * specifically kernel LSM modules, to provide a consistent, transparent API
90 * for dealing with explicit packet labeling protocols such as CIPSO and
91 * RIPSO. The functions defined here are implemented in the
92 * net/netlabel/netlabel_kapi.c file.
93 *
94 */
95
96/* NetLabel audit information */
97struct netlbl_audit {
98 u32 secid;
99 uid_t loginuid;
100};
101
102/* Domain mapping definition struct */
103struct netlbl_dom_map;
104
105/* Domain mapping operations */
106int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
107
108/* LSM security attributes */
109struct netlbl_lsm_cache {
110 atomic_t refcount;
111 void (*free) (const void *data);
112 void *data;
113};
114/* The catmap bitmap field MUST be a power of two in length and large
115 * enough to hold at least 240 bits. Special care (i.e. check the code!)
116 * should be used when changing these values as the LSM implementation
117 * probably has functions which rely on the sizes of these types to speed
118 * processing. */
119#define NETLBL_CATMAP_MAPTYPE u64
120#define NETLBL_CATMAP_MAPCNT 4
121#define NETLBL_CATMAP_MAPSIZE (sizeof(NETLBL_CATMAP_MAPTYPE) * 8)
122#define NETLBL_CATMAP_SIZE (NETLBL_CATMAP_MAPSIZE * \
123 NETLBL_CATMAP_MAPCNT)
124#define NETLBL_CATMAP_BIT (NETLBL_CATMAP_MAPTYPE)0x01
125struct netlbl_lsm_secattr_catmap {
126 u32 startbit;
127 NETLBL_CATMAP_MAPTYPE bitmap[NETLBL_CATMAP_MAPCNT];
128 struct netlbl_lsm_secattr_catmap *next;
129};
130#define NETLBL_SECATTR_NONE 0x00000000
131#define NETLBL_SECATTR_DOMAIN 0x00000001
132#define NETLBL_SECATTR_CACHE 0x00000002
133#define NETLBL_SECATTR_MLS_LVL 0x00000004
134#define NETLBL_SECATTR_MLS_CAT 0x00000008
135#define NETLBL_SECATTR_CACHEABLE (NETLBL_SECATTR_MLS_LVL | \
136 NETLBL_SECATTR_MLS_CAT)
137struct netlbl_lsm_secattr {
138 u32 flags;
139
140 char *domain;
141
142 u32 mls_lvl;
143 struct netlbl_lsm_secattr_catmap *mls_cat;
144
145 struct netlbl_lsm_cache *cache;
146};
147
148/*
149 * LSM security attribute operations (inline)
150 */
151
152/**
153 * netlbl_secattr_cache_alloc - Allocate and initialize a secattr cache
154 * @flags: the memory allocation flags
155 *
156 * Description:
157 * Allocate and initialize a netlbl_lsm_cache structure. Returns a pointer
158 * on success, NULL on failure.
159 *
160 */
161static inline struct netlbl_lsm_cache *netlbl_secattr_cache_alloc(gfp_t flags)
162{
163 struct netlbl_lsm_cache *cache;
164
165 cache = kzalloc(sizeof(*cache), flags);
166 if (cache)
167 atomic_set(&cache->refcount, 1);
168 return cache;
169}
170
171/**
172 * netlbl_secattr_cache_free - Frees a netlbl_lsm_cache struct
173 * @cache: the struct to free
174 *
175 * Description:
176 * Frees @secattr including all of the internal buffers.
177 *
178 */
179static inline void netlbl_secattr_cache_free(struct netlbl_lsm_cache *cache)
180{
181 if (!atomic_dec_and_test(&cache->refcount))
182 return;
183
184 if (cache->free)
185 cache->free(cache->data);
186 kfree(cache);
187}
188
189/**
190 * netlbl_secattr_catmap_alloc - Allocate a LSM secattr catmap
191 * @flags: memory allocation flags
192 *
193 * Description:
194 * Allocate memory for a LSM secattr catmap, returns a pointer on success, NULL
195 * on failure.
196 *
197 */
198static inline struct netlbl_lsm_secattr_catmap *netlbl_secattr_catmap_alloc(
199 gfp_t flags)
200{
201 return kzalloc(sizeof(struct netlbl_lsm_secattr_catmap), flags);
202}
203
204/**
205 * netlbl_secattr_catmap_free - Free a LSM secattr catmap
206 * @catmap: the category bitmap
207 *
208 * Description:
209 * Free a LSM secattr catmap.
210 *
211 */
212static inline void netlbl_secattr_catmap_free(
213 struct netlbl_lsm_secattr_catmap *catmap)
214{
215 struct netlbl_lsm_secattr_catmap *iter;
216
217 do {
218 iter = catmap;
219 catmap = catmap->next;
220 kfree(iter);
221 } while (catmap);
222}
223
224/**
225 * netlbl_secattr_init - Initialize a netlbl_lsm_secattr struct
226 * @secattr: the struct to initialize
227 *
228 * Description:
229 * Initialize an already allocated netlbl_lsm_secattr struct.
230 *
231 */
232static inline void netlbl_secattr_init(struct netlbl_lsm_secattr *secattr)
233{
234 secattr->flags = 0;
235 secattr->domain = NULL;
236 secattr->mls_cat = NULL;
237 secattr->cache = NULL;
238}
239
240/**
241 * netlbl_secattr_destroy - Clears a netlbl_lsm_secattr struct
242 * @secattr: the struct to clear
243 *
244 * Description:
245 * Destroys the @secattr struct, including freeing all of the internal buffers.
246 * The struct must be reset with a call to netlbl_secattr_init() before reuse.
247 *
248 */
249static inline void netlbl_secattr_destroy(struct netlbl_lsm_secattr *secattr)
250{
251 if (secattr->cache)
252 netlbl_secattr_cache_free(secattr->cache);
253 kfree(secattr->domain);
254 if (secattr->mls_cat)
255 netlbl_secattr_catmap_free(secattr->mls_cat);
256}
257
258/**
259 * netlbl_secattr_alloc - Allocate and initialize a netlbl_lsm_secattr struct
260 * @flags: the memory allocation flags
261 *
262 * Description:
263 * Allocate and initialize a netlbl_lsm_secattr struct. Returns a valid
264 * pointer on success, or NULL on failure.
265 *
266 */
267static inline struct netlbl_lsm_secattr *netlbl_secattr_alloc(gfp_t flags)
268{
269 return kzalloc(sizeof(struct netlbl_lsm_secattr), flags);
270}
271
272/**
273 * netlbl_secattr_free - Frees a netlbl_lsm_secattr struct
274 * @secattr: the struct to free
275 *
276 * Description:
277 * Frees @secattr including all of the internal buffers.
278 *
279 */
280static inline void netlbl_secattr_free(struct netlbl_lsm_secattr *secattr)
281{
282 netlbl_secattr_destroy(secattr);
283 kfree(secattr);
284}
285
286#ifdef CONFIG_NETLABEL
287/*
288 * LSM security attribute operations
289 */
290int netlbl_secattr_catmap_walk(struct netlbl_lsm_secattr_catmap *catmap,
291 u32 offset);
292int netlbl_secattr_catmap_walk_rng(struct netlbl_lsm_secattr_catmap *catmap,
293 u32 offset);
294int netlbl_secattr_catmap_setbit(struct netlbl_lsm_secattr_catmap *catmap,
295 u32 bit,
296 gfp_t flags);
297int netlbl_secattr_catmap_setrng(struct netlbl_lsm_secattr_catmap *catmap,
298 u32 start,
299 u32 end,
300 gfp_t flags);
301
302/*
303 * LSM protocol operations
304 */
305int netlbl_enabled(void);
306int netlbl_sock_setattr(struct sock *sk,
307 const struct netlbl_lsm_secattr *secattr);
308int netlbl_sock_getattr(struct sock *sk,
309 struct netlbl_lsm_secattr *secattr);
310int netlbl_skbuff_getattr(const struct sk_buff *skb,
311 struct netlbl_lsm_secattr *secattr);
312void netlbl_skbuff_err(struct sk_buff *skb, int error);
313
314/*
315 * LSM label mapping cache operations
316 */
317void netlbl_cache_invalidate(void);
318int netlbl_cache_add(const struct sk_buff *skb,
319 const struct netlbl_lsm_secattr *secattr);
320#else
321static inline int netlbl_secattr_catmap_walk(
322 struct netlbl_lsm_secattr_catmap *catmap,
323 u32 offset)
324{
325 return -ENOENT;
326}
327static inline int netlbl_secattr_catmap_walk_rng(
328 struct netlbl_lsm_secattr_catmap *catmap,
329 u32 offset)
330{
331 return -ENOENT;
332}
333static inline int netlbl_secattr_catmap_setbit(
334 struct netlbl_lsm_secattr_catmap *catmap,
335 u32 bit,
336 gfp_t flags)
337{
338 return 0;
339}
340static inline int netlbl_secattr_catmap_setrng(
341 struct netlbl_lsm_secattr_catmap *catmap,
342 u32 start,
343 u32 end,
344 gfp_t flags)
345{
346 return 0;
347}
348static inline int netlbl_enabled(void)
349{
350 return 0;
351}
352static inline int netlbl_sock_setattr(struct sock *sk,
353 const struct netlbl_lsm_secattr *secattr)
354{
355 return -ENOSYS;
356}
357static inline int netlbl_sock_getattr(struct sock *sk,
358 struct netlbl_lsm_secattr *secattr)
359{
360 return -ENOSYS;
361}
362static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
363 struct netlbl_lsm_secattr *secattr)
364{
365 return -ENOSYS;
366}
367static inline void netlbl_skbuff_err(struct sk_buff *skb, int error)
368{
369 return;
370}
371static inline void netlbl_cache_invalidate(void)
372{
373 return;
374}
375static inline int netlbl_cache_add(const struct sk_buff *skb,
376 const struct netlbl_lsm_secattr *secattr)
377{
378 return 0;
379}
380#endif /* CONFIG_NETLABEL */
381
382#endif /* _NETLABEL_H */